update ktlint plugin to 0.1.5 and delete ktlint_disabled_rules from .editorconfig

[RBusarow]

KtLint changes for 0.1.5:

Fixed

• don't use coroutines from inside the ktlint worker in don't use coroutines from inside the ktlint worker rickbusarow/ktlint-gradle-plugin#74
• make format tasks cacheable in make format tasks cacheable rickbusarow/ktlint-gradle-plugin#75
• only register sourceSet-specific tasks after KGP is applied in only register sourceSet-specific tasks after KGP is applied rickbusarow/ktlint-gradle-plugin#76
  ☝️ this one means that the kotlin-dsl plugin's source set is excluded from the script tasks' source set

🧰 Maintenance

• split up CI jobs in split up CI jobs rickbusarow/ktlint-gradle-plugin#71

Full Changelog: rickbusarow/ktlint-gradle-plugin@0.1.4...0.1.5